README.md in mem-0.1.1 vs README.md in mem-0.1.2

@@ -36,5 +36,9 @@
 foo.bar #=> 1
 foo.has_memoized?(:bar) #=> true
 foo.memoized(:bar) #=> 1
 foo.memoized_table #=> { bar: 1 }
 ```
+
+### core ext
+If that makes you feel better, you can `require "mem/core_ext"` to avoid `include Mem`,
+while this extends Object class.